The new update is around 1.2GB in size.

Android 5.0 Lollipop: Top Key Features of New Mobile OSOfficial Google Blog

It's been only few hours since Sony released the Android 5.0.2 Lollipop update to Xperia Z and ZR; now the company has begun rolling out Google's sweet candy flavoured mobile firmware to some more devices through OTA (Over-The-Air).

If Xperia Z series device owners are getting the update notifications, they should select - "Yes, Download" option >>; after downloading, they should select >> "Install now." The phone will restart automatically and the OS will be updated to the new version.

We like to remind out readers that the roll-out process is carried out in phases, so it will take some time to reach all corners of the world.

The new update is around 1.2GB in size. The new Android 5.0.2 Lollipop brings in a new design language - "Material Design", with interactive user interface, lots of animation graphics and lock-screen notification options. The replacement of Dalvik with ART as default runtime will bring improvement in performance-and-battery-life enhancement and many more features.

But, US-based network carrier T-Mobile is yet to release the update to locked version of Xperia Z3 and Xperia Z1s. The good news is that Android 5.0 Lollipop firmware for the aforementioned devices has just entered testing phase, hinting that the wait for the update in the USA might end by the end of this month or June.